Not complaining or anything (I'm the admin on some other lists myself), but there was a post that seems to have never showed up, and I don't know how to verify that it is in the queue waiting for moderation.

Is a post on the topic "How Consciousness Solves the Problem of Free Will." on "General Philosophy"

Can a post get lost in the mod queue?

It can take a while. It wasn't lost but just waiting. While on moderation, my advice is to make short posts. Keep the longer ones for the time when you can post unmoderated. It is less frustrating that way.